One New Study for First Proving of the "Pythagorean Theorem"

It is generally considered that the Greece mathematician, Pythagoras, first proved the Pythagorean theorem, but this is not reliable. Even if admit this view, in the western countries the time of first proof of the Pythagoras theorem is not probably early than epoch ago 585 year. It is considered that in China, the mathematician of fust proof of the Pythagorean theorem is Zhao shuang, who live in the third century a. d., this essay aralysed that no later than 1105 B. C, the ancient Chinese, Shang Gao, already knew the use of the hypotenuse graph Proving the Pythagorean theorem. This may be 520 years earlier than western countries.